B had a few times that he didn't prepare the FHE lesson even with a lot of offers of help.  So now when it is his turn, I sit down with him before dinner and have him dictate his topic and lesson following a form like this one.  It's nice to develop a sense of competence in him.  He is pleased to give his lesson.  He knows it feels good to be prepared.  It's OK to need help, even if you don't like getting help, and B does not like getting help.